View full sizeDAN GLEITER, The Patriot-NewsAir travelers at Harrisburg International Airport line up for security screening from the Transportation Security Administration on the day before Thanksgiving.

The quiet neighborhood surrounding the U.S. Army War College in Carlisle heard the sounds of the base testing its “mass emergency warning system” Monday afternoon.

What amounted to a loud doorbell played over the base’s public address system for about 60 seconds just after 3 p.m., followed by a voice saying it was only a test.

And at the Three Mile Island nuclear plant and Harrisburg International Airport, officials said high security is already in place.

TMI spokesman Ralph DeSantis said security around the nuclear plant is always hyper-vigilant and that Exelon, the plant’s owner, never releases specific information about its security procedures. However, DeSantis did say that in the years since 9/11, information sharing among law enforcement, government and other agencies has improved.

“We’re very much plugged into whatever’s going on,” DeSantis said.

Scott Miller, spokesman for Susquehanna Area Regional Airport Authority, which operates Harrisburg International and Capital City airports, said everything was status quo at both locations. Miller, too, said the authority never discusses its security procedures.

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